Factoring Worksheet With Examples Page 29
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42.
FIND THE ERROR
Dasan and Luther are factoring 2 x
+ 11x + 18. Who is
correct? Explain your reasoning.
Dasan
Luther
2
2
2
2 x
+ 11x + 18 = 2( x
+ 11x + 18)
2 x
+ 11x + 18 is prime.
= 2(x + 9)(x + 2)
Writing in Math
43.
Explain how to determine which values should be
2
chosen for m and n when factoring a polynomial of the form a x
+ bx + c.
44. Which of the following shows
45.
REVIEW
An oak tree grew 18 inches per
2
6x
+ 24x + 18 factored completely?
year from 1985 to 2006. If the tree was
25 feet tall in 1985, what was the height
2
A (3x + 6)
of the tree in 2001?
B (3x + 3)(2x + 6)
F 31.0 ft
C (3x + 2)(2x + 9)
G 49.0 ft
D (6x + 3)(x + 6)
H 56.5 ft
J 80.5 ft
Factor each trinomial, if possible. If the trinomial cannot be factored using
integers, write prime.
(Lesson 8-3)
2
2
46. a
47. t
48. d
2
- 4a - 21
+ 2t + 2
+ 15d + 44
Solve each equation. Check the solutions.
(Lesson 8-2)
2
49. (y - 4)(5y + 7) = 0
50. (2k + 9)(3k + 2) = 0
51. 12u = u
CAMERAS
For Exercises 52 and 53, use the graph at
Digital Camera Sales
the right.
(Lessons 2-7 and 7-3)
60
52. Find the percent of increase in the number of
digital cameras sold from 1999 to 2003.
50
50.0
53. Use the answer from Exercise 52 to verify the
40
statement that digital camera sales increased
more than 9 times from 1999 to 2003 is correct.
30
30.5
20
18.5
PREREQUISITE SKILL
Find the principal square root
10
11.0
of each number.
(Lesson 1-8)
5.5
0
54. 49
55. 36
56. 100
1999
2000
2001
2002
2003
Year
57. 121
58. 169
59. 225
Source: Digital Photography Review
446
Chapter 8 Factoring
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